According to phys.org: This is very unclear to me. How would one coarsen a reference angle? It seems to me it would be very difficult to set an angle without being able to check it later to determine exactly what angle you ended up setting. On the other hand, coarsening the detection would seem to mean using a detector with a large aperture so that when a detection is made, it will not be precisely where the particle was detected. Would that be a good example?